|Outcome|No.|Date|Championship|Surface|Opponent|Score|
|---|---|---|---|---|---|---|
|Runner-up|1.|1973|Baltimore, U.S.|Hard (i)|Jimmy Connors|4–6, 5–7|
|Winner|1.|1974|Baltimore, U.S.|Carpet|Clark Graebner|6–2, 6–1|
|Runner-up|2.|1974|Birmingham, U.S.|Carpet|Jimmy Connors|5–7, 3–6|
|Winner|2.|1974|Paramus, U.S.|Indoor|Jürgen Fassbender|6–1, 6–3|
|Winner|3.|1974|Jackson, U.S.|Carpet|Karl Meiler|7–6, 7–5|
|Runner-up|3.|1975|Maui, U.S.|Hard|Jimmy Connors|1–6, 0–6|
|Runner-up|4.|1975|Hong Kong|Hard|Tom Gorman|3–6, 1–6, 1–6|
|Winner|4.|1977|Little Rock, U.S.|Carpet|Haroon Rahim|6–2, 6–4|
|Runner-up|5.|1977|San Jose, U.S.|Hard|Jiří Hřebec|6–3, 4–6, 5–7|
|Winner|5.|1977|Hampton, U.S.|Carpet|Stan Smith|4–6, 6–3, 6–2, 1–6, 6–3|
|Winner|6.|1977|Stockholm, Sweden|Hard (i)|Raymond Moore|6–2, 6–4|
|Winner|7.|1978|St. Louis WCT, U.S.|Carpet|Eddie Dibbs|7–6, 6–4|
|Runner-up|6.|1980|Surbiton, England|Grass|Brian Gottfried|3–6, 3–6|
|Runner-up|7.|1981|Los Angeles, U.S.|Hard|John McEnroe|7–6, 3–6, 3–6|
|Runner-up|8.|1981|Cologne, Germany|Hard (i)|Ivan Lendl|3–6, 3–6|
|Runner-up|9.|1981|Stockholm, Sweden|Hard (i)|Gene Mayer|4–6, 2–6|
|Winner|8.|1981|Bologna, Italy|Carpet|Ilie Năstase|7–5, 6–3|
|Runner-up|10.|1982|Stuttgart Outdoor, Germany|Clay|Ramesh Krishnan|7–5, 3–6, 3–6, 6–7|
|Winner|9.|1982|Cleveland, U.S.|Hard|Robert Van't Hof|7–5, 6–3|
|Winner|10.|1983|Gstaad, Switzerland|Clay|Tomáš Šmíd|6–0, 6–3, 6–2|

Question: how many different countries are listed?
Answer: 7